anime conventions are held pretty much everywhere. you just need to look one up that's in your area.
and the majority of people I know of make their costumes. Buying them can be very expensive and I personally think that takes a bit of the fun out of cosplaying.
eBay is a good place to buy costumes if your in major need of one.

Lol i can't see the pic either...
BUt ima cosplay too! Dunno who yet but me n a huge group of friends are gonna go to a con all dressed cosplay'd n stuff. Its funny, we're force'n a friend who wants to go to the con even though she doesn't like anime (dunno why she wants to go) To cosplay too! We might make her al from fma XP